LTC3589/LTC3589-1/ LTC3589-2 - 8-Output Regulator with Sequencing and I2C


  • Triple I2C Adjustable High Efficiency Step-Down DC/DC Converters: 1.6A, 1A/1.2A, 1A/1.2A
  • High Efficiency 1.2A Buck-Boost DC/DC Converter
  • Triple 250mA LDO Regulators
  • Pushbutton ON/OFF Control with System Reset
  • Flexible Pin-Strap Sequencing Operation
  • I2C and Independent Enable Control Pins
  • Power Good and Reset Outputs
  • Dynamic Voltage Scaling and Slew Rate Control
  • Selectable 2.25MHz or 1.12MHz Switching Frequency
  • Always-Alive 25mA LDO Regulator
  • 8μA Standby Current
  • 40-Pin 6mm × 6mm × 0.75mm QFN
  • Click here for Freescale i.MX53 reference design and driver support information

Typical Application

LTC3589 Typical Application
LTC3589 Typical Application


The LTC®3589 is a complete power management solution for ARM and ARM-based processors and advanced portable microprocessor systems. The device contains three step-down DC/DC converters for core, memory and SoC rails, a buck-boost regulator for I/O at 1.8V to 5V and three 250mA LDO regulators for low noise analog supplies. An I2C serial port is used to control enables, output voltage levels, dynamic voltage scaling, operating modes and status reporting. Differences between the LTC3589, LTC3589-1, and LTC3589-2 are summarized in Table 1.

Regulator start-up is sequenced by connecting outputs to enable pins in the desired order or programmed via the I2C port. System power-on, power-off, and reset functions are controlled by pushbutton interface, pin inputs, or I2C interface.

The LTC3589 supports i.MX53/51, PXA and OMAP processors with eight independent rails at appropriate power levels. Other features include interface signals such as the VSTB pin that simultaneously toggle up to four rails between programmed run and standby output voltages. The device is available in a low profile 40-pin 6mm × 6mm exposed pad QFN package.

Power-On Inhibit Enable Delay 1 second 2ms 2ms
Buck 2 & 3 Current Output 1A 1.2A 1.2A
PGOOD Fault Timeout Enabled Default, I2C Disable Disabled by Default, I2C Enable Disabled by Default, I2C Enable
PWR_ON to WAKE Delay 50ms 2ms 2ms
LDO3 Vout 1.8V 2.8V 2.8V
LDO4 Vout 1.8V, 2.5V, 2.8V, 3.3V 1.2V, 1.8V, 2.5V, 3.2V 1.2V, 1.8V, 2.5V, 3.2V
LDO4 Vout 1.8V, 2.5V, 2.8V, 3.3V 1.2V, 1.8V, 2.5V, 3.2V 1.2V, 1.8V, 2.5V, 3.2V
Default LDO4 Enable LDO34_EN (Pin) or I2C I2C Only I2C Only
Wait to Enable Until Output < 300mV Yes. Change with I2C Yes. Change with I2C No. Change with I2C
Insert 2.5K Discharge Resistor When Disabled Yes when Wait to Enable Until Output < 300mV Yes when Wait to Enable Until Output < 300mV Always inserted when regulator disabled


For complete and up to date package information and drawings, please refer to our packaging page

6x6 QFN-40

LTC3589 Package Drawing
LTC3589 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3589EUJ#PBF QFN 40 E $6.64 $4.65 View
LTC3589EUJ#TRPBF QFN 40 E $4.71 View
LTC3589EUJ-1#PBF QFN 40 E $6.64 $4.65 View
LTC3589EUJ-1#TRPBF QFN 40 E $4.71 View
LTC3589EUJ-2#PBF QFN 40 E $6.64 $4.65 View
LTC3589EUJ-2#TRPBF QFN 40 E $4.71 View
LTC3589HUJ#PBF QFN 40 H $8.14 $5.70 View
LTC3589HUJ#TRPBF QFN 40 H $5.76 View
LTC3589HUJ-1#PBF QFN 40 H $8.14 $5.70 View
LTC3589HUJ-1#TRPBF QFN 40 H $5.76 View
LTC3589HUJ-2#PBF QFN 40 H $8.14 $5.70 View
LTC3589HUJ-2#TRPBF QFN 40 H $5.76 View
LTC3589IUJ#PBF QFN 40 I $7.64 $5.35 View
LTC3589IUJ#TRPBF QFN 40 I $5.41 View
LTC3589IUJ-1#PBF QFN 40 I $7.64 $5.35 View
LTC3589IUJ-1#TRPBF QFN 40 I $5.41 View
LTC3589IUJ-2#PBF QFN 40 I $7.64 $5.35 View
LTC3589IUJ-2#TRPBF QFN 40 I $5.41 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1558A LTC3589EUJ Demo Board | 8-Output Regulator with Sequencing & I2C, 2.7V ≤ VIN ≤ 5.5V, Vout1-8 = 1.2V to 3.3V @ 25mA to 1.6A $250.00
DC1808B-A LTC3589EUJ-1 Demo Board | 8-Output Regulator with Sequencing & I2C, 2.7V ≤ VIN ≤ 5.5V, Vout1-8 = 1.2V to 3.3V @ 25mA to 1.6A $250.00
DC1808B-B LTC3589EUJ-2 Demo Board | 8-Output Regulator with Sequencing & I2C, 2.7V ≤ VIN ≤ 5.5V, Vout1-8 = 1.2V to 3.3V @ 25mA to 1.6A $250.00
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Companion Boards

Part Number Description Price Documentation
DC590B USB Serial Controller for Linear Technology QuikEval Demo Boards $50.00
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Click here to view our complete list of demo boards


  • Handheld Instruments and Scanners
  • Portable Industrial Devices
  • Automotive Infotainment
  • Medical Devices
  • High End Consumer Devices
  • Multirail Systems
  • Supports Freescale i.MX53/51, Marvell PXA and Other Application Processors

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Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

For resources and information on drivers for the LTC3589 in Windows, Linux and Android operating systems, download the LTC3589 Driver Software support documentation.

For more information on using the LTC3589 in conjunction with Freescale development tools and reference designs, please refer to:

Technical Support